.page-about {
  --c-accent: #7B2FF7;
  --c-accent-2: #FF9F1C;
  --c-bg: #0A1128;
  --c-bg-alt: #1F1F2E;
  --c-text: #FFFFFF;
  --c-text-sub: #E0E0E0;
  --c-border: #3A3A5C;
  --c-glass: rgba(255, 255, 255, 0.08);
  --font-head: Impact, Anton, 'Arial Black', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-body: Inter, -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --font-mono: 'SF Mono', SFMono-Regular, Consolas, 'Liberation Mono', Menlo, monospace;
  --radius-lg: 1.5rem;
  --radius-md: 0.875rem;
  --radius-pill: 999px;
}

.page-about {
  background: var(--c-bg);
  color: var(--c-text);
}

.page-about__head-cta {
  display: inline-block;
  margin-top: 1rem;
}

.page-about__mission {
  position: relative;
}

.page-about__mission-grid {
  display: grid;
  gap: 2rem;
}

.page-about__mission h2 {
  font-family: var(--font-head);
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  line-height: 1.15;
  margin: 0.5rem 0 1rem;
  letter-spacing: 0.02em;
}

.page-about__mission-copy {
  color: var(--c-text-sub);
  font-size: 1rem;
  line-height: 1.8;
  margin: 0 0 1rem;
}

.page-about__mission-points {
  margin-top: 1.5rem;
}

.page-about__mission-points li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.5rem 0;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--c-text);
  border-bottom: 1px solid rgba(58, 58, 92, 0.6);
}

.page-about__mission-points li:last-child {
  border-bottom: 0;
}

.page-about__mission-icon {
  color: var(--c-accent-2);
  font-size: 0.875rem;
  margin-top: 0.2rem;
}

.page-about__mission-figure {
  margin: 0;
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--c-border);
  background: var(--c-bg-alt);
}

.page-about__mission-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about__mission-figcap {
  position: absolute;
  right: 0.75rem;
  bottom: 0.75rem;
  background: rgba(10, 17, 40, 0.85);
  border: 1px solid var(--c-border);
  color: var(--c-text-sub);
  font-size: 0.75rem;
  padding: 0.375rem 0.75rem;
  border-radius: 999px;
  backdrop-filter: blur(6px);
}

.page-about__journey-lead,
.page-about__team-lead,
.page-about__cert-lead,
.page-about__eco-lead {
  color: var(--c-text-sub);
  font-size: 1rem;
  line-height: 1.6;
  max-width: 46rem;
}

.page-about__timeline-wrap {
  position: relative;
  margin-top: 2.5rem;
}

.page-about__timeline-bg {
  position: absolute;
  inset: 2rem 0 1rem;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--c-border);
  z-index: 0;
}

.page-about__timeline-bg-img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 640px;
  object-fit: cover;
  object-position: center;
  filter: grayscale(0.4) brightness(0.7);
}

.page-about__timeline-bg-veil {
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 17, 40, 0.95) 0%, rgba(10, 17, 40, 0.78) 45%, rgba(10, 17, 40, 0.95) 100%);
}

.page-about__timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 2rem 0.25rem;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.page-about__timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  column-gap: 1.25rem;
  padding-left: 1rem;
}

.page-about__timeline-node {
  grid-row: 1 / span 2;
  grid-column: 1;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--c-accent-2);
  border: 3px solid var(--c-bg);
  box-shadow: 0 0 0 3px rgba(255, 159, 28, 0.35);
  margin-top: 0.6rem;
}

.page-about__timeline-node::after {
  content: "";
  position: absolute;
  top: 1.2rem;
  left: 1.5rem;
  width: 2px;
  height: calc(100% + 0.5rem);
  background: linear-gradient(180deg, var(--c-accent-2) 0%, var(--c-accent) 100%);
  opacity: 0.35;
}

.page-about__timeline-item:last-child .page-about__timeline-node::after {
  display: none;
}

.page-about__timeline-node--current {
  background: var(--c-accent);
  box-shadow: 0 0 0 4px rgba(123, 47, 247, 0.35);
}

.page-about__timeline-year {
  grid-column: 2;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--c-accent-2);
  letter-spacing: 0.08em;
  line-height: 1.5;
}

.page-about__timeline-card {
  grid-column: 2;
  background: rgba(31, 31, 46, 0.9);
  border: 1px solid var(--c-border);
  border-radius: var(--radius-md);
  padding: 1rem 1.25rem;
  backdrop-filter: blur(10px);
  transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

.page-about__timeline-card h3 {
  font-family: var(--font-head);
  font-size: 1.125rem;
  margin: 0 0 0.375rem;
  color: var(--c-text);
  letter-spacing: 0.02em;
}

.page-about__timeline-card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--c-text-sub);
}

.page-about__timeline-card:hover {
  border-color: rgba(123, 47, 247, 0.7);
  box-shadow: 0 0 24px rgba(123, 47, 247, 0.15);
  transform: translateX(4px);
}

.page-about__team-grid {
  display: grid;
  gap: 2rem;
  margin-top: 2rem;
}

.page-about__team-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--c-border);
  background: var(--c-bg-alt);
}

.page-about__team-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about__team-stats {
  align-self: center;
}

.page-about__stat {
  transition: border-color 0.3s ease, transform 0.3s ease;
}

.page-about__stat:hover {
  border-color: rgba(255, 159, 28, 0.6);
  transform: translateY(-4px);
}

.page-about__stat-value {
  color: var(--c-accent-2);
  font-family: var(--font-head);
  font-size: 2.75rem;
  line-height: 1;
}

.page-about__team-list {
  margin-top: 1.5rem;
  display: grid;
  gap: 0.875rem;
}

.page-about__team-list-item {
  display: flex;
  align-items: flex-start;
  gap: 0.875rem;
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--c-accent);
  background: var(--c-glass);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  transition: border-color 0.3s ease, background 0.3s ease;
}

.page-about__team-list-item:hover {
  border-left-color: var(--c-accent-2);
  background: rgba(123, 47, 247, 0.15);
}

.page-about__team-list-dot {
  position: relative;
  top: 0.2rem;
  flex: 0 0 0.625rem;
  width: 0.625rem;
  height: 0.625rem;
  border-radius: 50%;
  background: var(--c-accent-2);
  border: 2px solid rgba(255, 159, 28, 0.3);
}

.page-about__team-list-item strong {
  display: block;
  color: var(--c-text);
  margin-bottom: 0.2rem;
  font-weight: 600;
}

.page-about__team-list-item span span {
  color: var(--c-text-sub);
}

.page-about__cert-grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}

.page-about__cert-card {
  padding: 1.75rem 1.5rem;
  gap: 0.875rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

.page-about__cert-card:hover {
  border-color: rgba(255, 159, 28, 0.6);
  box-shadow: 0 0 24px rgba(255, 159, 28, 0.12);
  transform: translateY(-4px);
}

.page-about__cert-icon {
  color: var(--c-accent);
  width: 2.75rem;
  height: 2.75rem;
  display: block;
}

.page-about__cert-title {
  font-family: var(--font-head);
  font-size: 1.125rem;
  letter-spacing: 0.02em;
}

.page-about__cert-text {
  color: var(--c-text-sub);
  font-size: 0.875rem;
  line-height: 1.7;
  margin: 0;
}

.page-about__eco-grid {
  display: grid;
  gap: 1.25rem;
  margin-top: 2rem;
}

.page-about__eco-card {
  padding: 1.75rem 1.5rem;
  border-radius: var(--radius-lg);
  position: relative;
}

.page-about__eco-card--partners {
  background: linear-gradient(135deg, rgba(123, 47, 247, 0.2) 0%, rgba(10, 17, 40, 0.6) 55%, rgba(255, 159, 28, 0.08) 100%);
  border: 1px solid var(--c-border);
}

.page-about__eco-card--honors {
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
}

.page-about__eco-card--cta {
  background: radial-gradient(circle at 70% 30%, rgba(123, 47, 247, 0.28) 0%, rgba(10, 17, 40, 0.9) 65%);
  border: 1px solid rgba(123, 47, 247, 0.45);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.page-about__eco-heading {
  font-family: var(--font-head);
  font-size: 1.25rem;
  margin: 0 0 0.75rem;
  letter-spacing: 0.02em;
}

.page-about__eco-logos {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin: 1rem 0 1.25rem;
}

.page-about__eco-logo {
  display: inline-block;
  padding: 0.5rem 1rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--c-border);
  border-radius: 999px;
  font-size: 0.8125rem;
  font-family: var(--font-mono);
  color: var(--c-text-sub);
  transition: background 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.page-about__eco-logo:hover {
  background: rgba(123, 47, 247, 0.25);
  color: var(--c-text);
  border-color: var(--c-accent);
}

.page-about__eco-note {
  color: var(--c-text-sub);
  font-size: 0.875rem;
  line-height: 1.7;
  margin: 0;
}

.page-about__eco-honors-list {
  display: grid;
  gap: 0.875rem;
}

.page-about__eco-honors-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 0.9375rem;
  line-height: 1.6;
}

.page-about__eco-honor-icon {
  color: var(--c-accent-2);
  flex: 0 0 1.5rem;
  font-size: 1rem;
  margin-top: 0.2rem;
}

.page-about__eco-card--cta p {
  color: var(--c-text-sub);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin: 0;
}

.page-about__eco-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

/* layout arrangement for the three eco cards: partners + honors stack side by side, cta spans full width below */
@media (min-width: 40rem) {
  .page-about__mission-grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }

  .page-about__timeline-item {
    grid-template-columns: 1.5rem minmax(0, 1fr) minmax(0, 1fr);
    column-gap: 1.25rem;
    padding-left: 0;
  }

  .page-about__timeline-node {
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
    margin-top: 0.6rem;
  }

  .page-about__timeline-node::after {
    left: auto;
    right: auto;
    left: 50%;
    top: 1.4rem;
    transform: translateX(-50%);
    height: calc(100% + 2.2rem);
  }

  .page-about__timeline-year {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
    font-size: 1.0625rem;
    padding-top: 0.1rem;
  }

  .page-about__timeline-card {
    grid-column: 3;
    grid-row: 1;
  }

  .page-about__team-grid {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
  }

  .page-about__cert-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about__echo-grid {
    display: contents;
  }
}

@media (min-width: 50rem) {
  .page-about__eco-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about__eco-card--cta {
    grid-column: 1 / -1;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
  }

  .page-about__eco-links {
    margin-top: 0;
  }

  .page-about__timeline-bg-img {
    min-height: 780px;
  }
}

@media (min-width: 64rem) {
  .page-about__timeline-item:nth-child(odd) .page-about__timeline-card {
    transform: translateX(-2%);
  }

  .page-about__timeline-item:nth-child(even) .page-about__timeline-card {
    transform: translateX(2%);
  }
}